sonnywicaksono768-dev/project_pbl ? reverse-engineered prompt

Build me a clean Flutter starter app for this project.

I want a simple app that runs well on mobile, web, and desktop, with a polished home screen, basic navigation, and a few reusable UI components so it feels like a real starting point instead of an empty template. Keep it easy to understand and easy to extend later.

Please set up the main screen with a nice modern layout, make it responsive, and include a couple of sample pages or sections so I can see how the app is structured. Use the assets folder if needed for icons or images, and make sure the app launches without errors on the platforms already included in the project.

If anything in the current Flutter setup needs a quick update, do that too, and look up current Flutter docs online if you need to. Keep the code tidy and leave it in a state where I can build on it for the next features.